• Title/Summary/Keyword: Coal-Fired Power Plant

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Nitrogen Oxide (NOx) Emissions Prediction of Gas Turbine in Coal-Fired Power Plant Using Online Learning Method (온라인 학습법을 활용한 석탄화력 발전소의 가스 터빈 내 질소산화물(NOx) 배출량 예측)

  • Jin Park;Changwan Ko;Young-Seon Jeong
    • Smart Media Journal
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    • v.13 no.8
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    • pp.58-66
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    • 2024
  • Nitrogen oxides(NOx) in coal-fired power plants are significant contributors to air pollution, influencing the formation of ozone and fine particulate matter, thereby adversely affecting health. Therefore, accurate prediction of NOx emissions is essential. Existing researches have mainly performed based on off-line learning methods, leading to poor prediction performance with the limited training dataset. This paper proposes the online learning model of online support vector regression to predict NOx emissions from coal-fired power plants. Online learning model, which updates a model whenever new observations come out, demonstrates high prediction accuracy even when initial data is scarce. The experimental results showed that the performance of online learning prediction was better than existing off-line learning methods. The results indicated online learning method is a valuable tool for predicting NOx emissions, especially in situations where initial data is limited and data is continuously updated in real-time.

Calculation of CO2 Emission for Fossil-Fired Thermal Power Plant considering Coal-Oil Mix Rate (혼소율을 고려한 화력 발전소의 CO2 대기배출량 계산)

  • Lee, Sang-Joong;Kim, Soon-Ki
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.10
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    • pp.67-72
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    • 2010
  • G8 summit meeting held in July 2008 decided to set up a long-term goal, by 2050, reducing the world greenhouse emissions by half of those emitted in 1990. In November 2009, the Government announced to reduce the national $CO_2$ emission by 30[%] of BAU by 2020. Electric power industries in Korea produce most of their electricity by burning fossil fuels, and emit approximately 28[%] of national $CO_2$ emissions. Monitoring the $CO_2$ emissions. Monitoring the $CO_2$ emission of electric power plants is very important. This paper presents a method to calculate the hourly $CO_2$ emission for a thermal power plant burning mixture of coal and oil using the performance test data and coal-oil mix rate. An example of $CO_2$ emission calculation is also demonstrated.

Effect of Boiler Operating Conditions on the Generation of Unburned Carbon in Anthracite Co-fired 500 MW Thermal Power Plant (무연탄 혼소 500 MW 석탄화력발전소에서 보일러 운전조건이 미연탄소 발생에 미치는 영향)

  • Nam, Jeong-Chul;Yoo, Ho-Seon
    • Plant Journal
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    • v.14 no.3
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    • pp.35-41
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    • 2018
  • Considering the recent government policy toward North Korea and situation of power facilities in North Korea, it will be necessary to prepare for the consumption of the anthracite coal from Korea in coal-fired power plants. In this study, the anthracite co-fired tests in 500 MW thermal power plants were conducted with varying the main operation conditions, such as anthracite injection position in the boiler, coal fineness and combustion air flow, to investigate the effects on the generation of unburned carbon. It was confirmed that the generation of unburned carbon was remarkably reduced when the anthracite coal was injected into the boiler low burner with a relatively long residence time in the main combustion region, and that the increase of the coal fineness proportional to the combustion reaction surface area also reduces the generation of unburned carbon. An increase in the combustion air flow, which increase the combustion reactivity, also contributes to the reduction of unburned carbon. It is possible to maintain the unburned carbon generation below 5 % of the ash recycling quality by controlling the above operating conditions for the given mixing rate of anthracite, and the priority of changing the operating conditions within the test range is the highest for anthracite coal injection position.

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Characteristics of Unburned Material Derived from Coal-fired Power Plant Burning Low Grade Coal (저급탄 연소 석탄회의 미연물질 특성 분석)

  • Park, Ho-Young;Kim, Young-Ju;Kim, Tae-Hyung;Baek, Se-Hyun;Kim, Kyung-Soo;Jeoung, Kwon-Dal
    • Journal of Energy Engineering
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    • v.21 no.1
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    • pp.68-74
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    • 2012
  • Sub-bituminous coals have been used increasingly in coal-fired power plants with a proportion of over 50% in the blend with bituminous coals. As a result, the unburned material in fly ash has increased and is causing problems in utilizing the fly ash as an additive for concrete production. In this study, analysis of fly ash obtained from a 500 MWe power plant was carried out and unburned material in the fly ash found to be soot. The coals used in the plant were analyzed with CPD model to investigate the sooting potential depending on the coal type and blending ratio.

Development of CO2 Emission Factor by Fuel and CO2 analysis at Sub-bituminous Fired Power Plant (연료와 CO2 농도분석을 이용한 아역청탄 화력발전소의 온실가스 배출계수 개발)

  • Jeon, Eui-Chan;Sa, Jae-Hwan
    • Journal of Environmental Health Sciences
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    • v.36 no.2
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    • pp.128-135
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    • 2010
  • The main purpose of this study was to develop the greenhouse gas emission factor for power plant using sub-bituminous coal. In Korea, Fired power plant are a major source of greenhouse gases within the fossil fuel combustion sectors, thus the development of emission factors is necessary to understand the characteristics of the national specific greenhouse gas emission and to develop nation specific emission factors. These emission factors were derived from the $CO_2$ concentrations measurement from stack and fuel analysis of sub-bituminous coal. Caloric value of sub-bituminous coal used in the power plants were 5,264 (as received basis), 5,936 (air-dried basis) and 6,575 kcal/kg (dry basis). The C emission factors by fuel analysis and $CO_2$ concentration measurement was estimated to be 26.7(${\pm}0.9$), 26.3(${\pm}2.8$)tC/MJ, respectively. Our estimates of C emission factors were comparable with IPCC default value.

Rate of Unburned Carbon at Coal-Fired Thermoelectric Power Plant Boiler by the Plasma Burner Arc Currents (플라즈마 버너의 아크전류에 따른 석탄화력발전소 보일러 시동 시 미연탄소분율 연구)

  • Kang, Gyeong-Wan;Heo, Ki-Moo;Yoon, Sung-Hoon;Moon, Yoon-Jae;Yoo, Ho-sun;Lee, Jae-Heon
    • Plant Journal
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    • v.10 no.3
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    • pp.34-38
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    • 2014
  • Coal-fired power plants have used oil as fuel for start-up but plasma burner is recently introduced in order to reduce costs. It provides fuel oil-free start-up. But at initial operation of Plasma burner, an increase in unburned carbon remains as still pending issue. Also research and operational standards for this problem are insufficient. In this paper, operating procedure will be proposed through analyzing the impact of unburned carbon in accordance with the Plasma arc current. It is also possible to contribute to the national plant industry by demonstrating economics of Plasma burner in commissioning coal-fired power plants.

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Estimation of Emission and Development of Emission Factor on Greenhouse Gas (CO2) of the Combustion Facilities (연소시설의 온실가스(CO2) 배출량 산정 및 배출계수개발)

  • Kim, Hong-Rok;Jin, Byong-Bok;Yoon, Wan-Woo;Kwon, Young-Sung;Lee, Min-Young;Yoon, Young-Bong;Shin, Won-Geun
    • Journal of Environmental Impact Assessment
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    • v.16 no.4
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    • pp.277-283
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    • 2007
  • Since the Kyoto Protocol became into effect, Korea has been expected to be part of the Annex I countries performing the duty of GHG reduction in the phase of post-Kyoto. Therefore, it is necessary to develop emission factors appropriate to Korean circumstances. In order to develop emission factors this study utilized the CleanSYS, which is the real-time monitoring system for industrial smoke stacks to calculate the emission rate of $CO_2$ continuously. In this study, the main focus was on the power generation plants emitting the largest amount of $CO_2$ among the sectors of fossil fuel combustion. Also, an examination on the comparison of $CO_2$ emission was made among 3 generation plants using the different types of fuels such as bituminous coal and LNG; one for coal and others for LNG. The $CO_2$ concentration of the coal fired plant showed Ave. 13.85 %(10,384 ton/day). The LNG fired plants showed 3.16 %(1,031 ton/day) and 3.19 %(1,209 ton/day), respectably. Consequently, by calculating the emission factors using the above results, it was found that the bituminous coal fired power plant had the $CO_2$ emission factor average of 88,726 kg/TJ, and the LNG fired power plants had the $CO_2$ average emission factors of 56,971 kg/TJ and 55,012 kg/TJ respectably which were similar to the IPCC emission factor.

Estimation of Pollutant Sources in Dangjin Coal-Fired Power Plant Using Carbon Isotopes (탄소 안정동위원소를 이용한 석탄화력발전소 인근 오염원 기원 추정 : 당진시를 중심으로)

  • Yoon, Soohyang;Cho, Bong-Yeon
    • The Journal of the Korea Contents Association
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    • v.21 no.3
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    • pp.567-575
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    • 2021
  • Residents in Dangjin, South Chungcheong Province, in which large-scale emissions facilities such as coal-fired power plants and steel mills are concentrated, are very much concerned about their health despite the local government's aggressive efforts to improve air quality and reduce greenhouse gases. To understand the impact of coal-fired power plants and external factors on local air pollution, the origins of local pollutants were investigated using stable carbon isotopes that are generally used as tracers of the provenance of fine or ultrafine dust. The origins of the pollutants were analyzed with the data library, built using the seasonally measured data for the two separate locations selected considering the distance from the coal-fired power plant and the analysis of previous studies, and with the back trajectory analysis. As a result of analyzing stable isotope ratios, the tendency of high concentration was found in the order of winter > spring > fall > summer. According to the data matching with the library, the mobile pollutants and open-air incineration had a relatively higher impact on the local air pollution. It is believed that this study, as a pilot study, should focus on securing the reliability of the study results through continuous monitoring and data accumulation.

Measurement and analysis of PM10 and PM2.5 from chimneys of coal-fired power plants using a light scattering method (광산란법을 이용한 국내 석탄화력발전소 굴뚝에서 배출되는 PM10, PM2.5 측정 및 분석)

  • Shin, Dongho;Kim, Younghun;Hong, Kee-Jung;Lee, Gunhee;Park, Inyong;Kim, Hak-Joon;Kim, Yong-Jin;Han, Bangwoo;Hwang, Jungho
    • Particle and aerosol research
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    • v.16 no.4
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    • pp.131-140
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    • 2020
  • Air pollutants emitted from chimneys of coal-fired power plants are considered to be a major source of fine particulate matter in the atmosphere. In order to manage fine particle in the chimney of a coal-fired power plant, it is necessary to know the concentration of fine particle emitted in real time, but the current system is difficult. In this study, a real-time measurement system for chimney fine particle was developed, and measurements were performed on six coal-fired power plants. Through the measurements, the mass concentration distribution according to the particle size could be secured. All six chimneys showed bimodal distribution, and the count median diameters of each mode were 0.5 and 1.1 ㎛. In addition, it was compared with the gravimetric measurement method, and it was determined that the relative accuracy for PM10 was within 20%, and the value measured using the developed measuring instrument was reliable. Finally, three power plants were continuously measured for one month, and as a result of comparing the concentration of PM10 according to the amount of power generation, it was confirmed that the PM10 discharged from the chimney increased in the form of an exponential function according to the amount of power generation.

Performance Evaluation of an Oxy-coal-fired Power Generation System - Thermodynamic Evaluation of Power Cycle (순산소 석탄 연소 발전 시스템의 성능 평가 - 동력 사이클의 열역학적 해석)

  • Lee, Kwang-Jin;Choi, Sang-Min;Kim, Tae-Hyung;Seo, Sang-Il
    • Journal of the Korean Society of Combustion
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    • v.15 no.2
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    • pp.1-11
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    • 2010
  • Power generation systems based on the oxy-coal combustion with carbon dioxide capture and storage (CCS) capability are being proposed and discussed lately. Although a large number of lab scale studies for oxy-coal power plant have been made, studies of pilot scale or commercial scale power plant are not enough. Only a few demonstration projects for oxy-coal power plant are publicized recently. The proposed systems are evolving and various alternatives are to be comparatively evaluated. This paper presents a proposed approach for performance evaluation of a commercial 100 MWe class power plant, which is currently being considered for 'retrofitting' for the demonstration of the concept. The system is configurated based on design and operating conditions with proper assumptions. System components to be included in the discussion are listed. Evaluation criteria in terms of performance are summarized based on the system heat and mass balance and simple performance parameters, such as the fuel to power efficiency and brief introduction of the second law analysis. Also, gas composition is identified for additional analysis to impurities in the system including the purity of oxygen and unwanted gaseous components of nitrogen, argon and oxygen in air separation unit and $CO_2$ processing unit.